Bond breaking machines



Oct. 21, 1958 s. H. COOK BOND BREAKING MACHINES Filed Dec. 21, 1956 Inventor Szdney H G0 0k United States Patent BOND BREAKHIG MACHINES Sidney H. Cook, Hannibal, Mo., assignor to United Shoe Machinery Corporation, Flemington, N. .l., a corporation of New Jersey Application December 21, 1956, Serial No. 629,916

2 Claims. (Cl. 12-1) This invention relates to machines for breaking an adhesive bond between the overlasted upper of a womens shoe and the heel seat portion of an attached outsole of the shoe preparatory to fitting said heel seat portion for the reception of a wood heel, the illustrative machine being similar to the machine disclosed in United States Letters Patent No. 2,180,414, granted November 21, 1939 upon an application filed in the name of George Hazelton and being advantageously mounted on the frame of a heel seat fitting machine of the general type described in United States Letters Patent'No. 2,187,150, granted January 16, 1940 on an application filed in the name of George Hazelton.

Most womens shoes now manufactured have their outsoles attached, for example, by polychloroprene cement or by cements consisting of butadiene acrylonitrile copolymer and synthetic rubber having an acrylonitrile content from about 25% to 45% of the copolymer. In fitting the heel seat portions of attached outsoles of womens shoes for the reception of wood heels it is the general practice as disclosed in said Patent No. 2,187,150 to deform the heel seat portion of the outsole preparatory to forming heel breast receiving shoulders on said outsole and forming on the heel seat portion of the outsole a heel seat tab which is beveled at its margin from one heel breast receiving shoulder to the other.

Cements used in the attachment of the outsoles to the overlasted uppers of shoes usually extend rearwardly of the heel breast line of the outsole and thus secure at least the forward lateral margins of said heel seat portion of the outsole to the overlasted upper of the shoe. With the foregoing considerations in view it is desirable that the cement bond between the overlasted upper of the shoe and the heel seat portion of the attached outsole of the shoe shall be broken rearwardly of the heel breast line before the shoe is fitted for the reception of the wood heel by the' use of the above-mentioned heel seat fitting machine or by other similar machines commonly used for that purpose.

' It has been found that, when the machine disclosed in Patent No. 2,180,414 isused to break the above-mentioned present day cement bonds between the overlasted uppers of shoes and the heel seat portions of the attached outsoles of shoes, the vibrating knives of the machine tend to gum up, and the heel seat portions of the outsoles, especially those made of synthetic rubberized materials, tend to split adjacent to the cement bond.

It is an object of the present invention to adapt the machine disclosed in Patent No. 2,180,414 for splitting the present day cement bonds which attach the heel seat portions of leather or synthetic outsoles to overlasted uppers of the shoes to which the outsoles have been cement attached.

With the above object in view the illustrative bond breaking machine comprises a plate or bridge which has a thin forward edge and is adapted to be interposed between the overlasted upper of the shoe and the heel seat portion of the attached outsole of the shoe, and in ac- 2,856,618 Patented Oct. 21, 1958 cordance with a feature of the invention, means for heating said bridge to the proper temperature to break said bond in response to pressure between the bond and the plate.

The present invention consists in the above and hereinafter described novel features, reference being had to the accompanying drawings which illustrate one embodiment of the same selected for purposes of illustration, the invention being fully described in the following description and claims.

In the accompany drawings,

Figs. 1 and 2 are front and plan views respectively, partly in section and partly broken away, of an il1ustrative machine;

Fig. 3 is a section on line III-III of Fig. 1;

Fig. 4 is an enlarged plan view showing the bond breaking knives of the machine in unmasked operative positions, a shoe being operatedupon by the machine having been moved rearwardly against the back gage;

Fig. 5 is a perspective view of a heel end of the shoe after it has been operated upon by the illustrative machine, a cement bond between an overlasted upper of the shoe and the heel seat portion of the attached outsole of the shoe having been broken by the use of the illustrative machine; and

Fig. 6 is a section on the line VI-VI of Fig. 1 showing a portion of a work supporting plate or bridge of the machine.

It is common practice to attach outsoles 10 to roughened overlasted uppers 12 of shoes 14 by the use of cements of the types referred to above. In order to prepare the margins of the flesh sides 16 of the outsoles 10 and the overlasted uppers 12 of the shoes 14 for the reception of cement, said margins and overlasted uppers are roughened by well-known machines (not shown) provided for this purpose, the cement being later applied to the roughened overlasted uppers and margins and being allowed to dry, the cement on said margins and overlasted uppers being activated by suitable solvent just before the outsoles are attached to the shoes.

In fitting heel seat portions 18 of the attached outsoles 10 of the shoes 14 by the use of machines such as disclosed in said Patent No. 2,187,150, for example, it is desirable that said heel seat portion shall remain unattached rearwardly of a heel breast line 20 of the outsole in order that the heel seat portion shall be effectively flexed or deformed to a predetermined shape preparatory to being trimmed. It is highly desirable that the outsole 10 shall be effectively cemented to the overlasted upper 12 of the shoe 14 rearwardly to the heel breast line 20, but since it is impracticable to determine the exact location of said line prior to the attachment of the outsole to the shoe the cement bond usually extends rearwardly of theheel breast line and has to be broken before the shoe can be effectively presented to the heel seat fitter.

The illustrative machine is similar to the machine disclosed in said Patent No. 2,180,414 and comprises an arch piece 34 which is secured by screws 30 to a casting 32 having an arcuate guideway 36 in which. slides 38, 39 are movable, said slides being arranged side-by-side in the guideway between upstanding walls of the arch piece and being covered by a plate 40 secured by screws 42 to said arch piece.

Mounted in the casting 32 is a horizontal shaft 44, which has a drive pulley 46 attached to it, and has also secured to it a pair of eccentrics 48 upon which are mounted connecting rods 50 pivotally connected to the respective slides 38, 39. When the shaft 44 is rotated the slides 38, 39 oscillate in the guideway 36, the throws of the eccentrics 48 being such that the forward and rear slides 38, 39 simultaneously reach their outer and inner limits'of movement. Formed integral with the slides 38,

39 are split depending portions 52, 53, respectively, each of which has a groove'55 for receiving a bond breaking knife 54, screws 56 serving to clamp the knives to said depending portions. Each of the knives 54 has a rounded forward end portion terminating in a cutting ed ge 53 and is in engagement. with an upper surface 60 of a plate or bridge 62 depending portions 62a of which are moved in horizontal paths along guideways 64 formed in the casting 32.

i The plate or bridge 62, which is V shaped in transverse cross section, is constantly urged forwardly along the guideways 64 into engagement stop screws 72 initially secured in their adjusted positions in lugs 74, which are secured by screws 76 to the casting 32, by 'coilsprings 76 which encircle rods 78 respectively-threaded into the depending portions 62:: of the plate or bridge, the forward and rear ends of said springs engaging respectively nuts 61 threaded onto the rods and the bottoms of the recesses 63 formed in lugs 65 secured by screws 67 to the casting 32. The rods 78 are secured against displacement in the depending portions 624 of the bridge 62 by nuts 69 and .the

stop screws 72 are'held in their adjusted positions upon the lugs 74 by nuts 71 -When the machine is idle the plate or bridge 62 is in engagement with the stop screws 72, the rear ends of the rods 73 at that time being spaced from the bottoms of the recesses 63 and the plate or bridge being in its full line position shown in Fig. 2 and its dash-dot line position shown in Fig. 4.

The plate or bridge 62 is slid rearwardly along the guideways 641, as willbe hereinafter explained," under pressure of the shoe until the rear ends of the rods '78 engage the bottoms of the associated recesses 63, said bridge then being in its full line position shown in Fig. 4 with the cutting edges'58 of the knives 54 extending slightly ahead of thin forward edges 62b of the plate. The upper surface 60 of the plate 62 is approximately concentric with the guideways 36 and accordingly the bond breaking knives 54 remain in contact with said upper face as they are oscillated or vibrated in response to rotation of the shaft 44. The plate or bridge 62 may be described as being constantly urged by the springs 76 to its position shown in Figs. 1 and 2 in which position the thin forward'edge 62b of the plate is arranged slightly in advance of the cutting edges 58 of the knives 54 and as being moved rearwardly by pressure of the shoe against it until the plate or bridge unmasks the knives 54 which then extend forwardly of the front edge 62b of the plate.

The machine illustrated in Patent 2,180,414 is adapted to cut lines of stitches (not shown), which extend'iearward of the heel breast'line 20, forwardly to said 'heel breast line and h'as also been found'to be satisfactory in the breaking of pyroxylin cement bonds securing the heel seat'portiorils of the outsole 1'0 to the roughened overlasted upper :12 of the shoe 14. As above noted, when outsoles mare adhesively secured to the roughened overlasted uppers 12 of the shoes 14 by the above-mentioned cements now commonlyused, the knives 54 tend to gum up and accordingly the shoes cannot be effectively moved rearwardly into engagement with a back gage 80. Accordingly the dependingportions 62a of the plate or bridge 62 have formed in them bores 82 for receiving cartridge heaters 84 wired to a rheostat 3 6 which may be adjusted to vary the amount of heat transmitted by the heaters to the plate or bridge 62 and accordingly to the knives 54 which engage said plate or bridge. It has been found that when watt cartridge heaters are incorporated in the plate or bridge the heat is 'suificient to break the adhesive bond between the heel seat portion 153 of the outsole 10 and the roughened overlasted upper 12 of the shoe 14.

The back gage may be initially located in a predetermined position along a guideway 88 in a fixed frame 90 of the machine in accordance with the length of a heel (not shown) which is to be attached to the shoe and is measured in a heel gage (notshowny Mechanism for 4 locating the back gage 80 in different operating positions in the 'guideway 88 is well known and may be'si'milar to mechanism disclosed in United States Letters Patent No. 1,840,030, granted January 5, 1932 on an application filed in the names of George Gouldbourn et al.

In the operation of the machine the inverted shoe 14 is moved rearwardly, heel end first, into the machine, the heel seat portion 18 of the outsole 10 of the shoe 14 sliding over the upper surface 60 of the plate or bridge 62 and the remaining portion of the heel end of the shoe passing beneath said plate. The plate 62 maintains a masking position in which its thin forward edge 62b is in front of the knives 5,4, as shown in full lines (Fig. 2), and in dash-dot lines (Fig. 4), until it is engaged by the cement bond between the lateral margins of the heel seat portion iii of the attached outsole 10 of the shoe 14 and the roughened overlasted upper 12 of the shoe, the knives 54 oscillating oryibrating transversely of and in engagement with said'plate with their cutting edges 58 ma k d. by the plate. When the above cement bond is forced against the forward edge 62b of the plate 62, said plateis moved rearwardly along the guideways 64 until the rear ends of the rods 78 engage the bottoms of the recesses63 at which time the cutting edges 58 of the knives 54 extend forwardly of the front edge 62b of the plate 62 in their exposed positions betweenthe heel seat portion 18 of the outsole 10 and the overlasted upper 12 of the shoe, said bond being broken forwardly to the heel breast line 20 of the shoe at the time the rear end of the shoe is brought into engagement with the initially setback gage 80. the shoe 14 has been moved into engagement with the back gage80, as above described, it is moved forwardly from the plate or bridge '62 which slides forward under the action of the springs 76 until it is stopped by the screws 72. i i 7' It will be understood that I contemplate removing the knives 54 from the depending portions of the slides 3 8,

39 and after setting the plate or bridge 62in a fixed or predetermined position, relying entirely upon the heat of the plate or bridge and the pressing of the shoe by the operator against said platefor the breaking of the cement bond between the overlasted upper 12 of the shoe 14 and the lateral margins of the heel seat portion 18 of the out: sole 10 of the shoe. In such a construction the plate. 62

is so positioned that when the rear counter portion of the shoe'14 engages the back gage 8 0 the front edge 62! of the plate will extend substantially along the heel breast line 20 of the outsole, thecement bond attaching the out-v sole to thei sho'e having: been broken forwardly tosaid heel breast line. i i V Having thus described my invention, what Iclaim as new and desire to secure by Letters Patent of the United States is: i i

1. A bond breaking machine having, in combination, a work support comprising a thin wedge-shaped bridge portion, which has an apex edge and is constructed and arranged for reception between the overlasted upper of a shoe and the heel seat portion of an attached outsole of the shoe, and depending portions which are continuous with opposite ends of said bridge portion and are of substantial mass and are spaced from each other by dis tances substantially greater than the width of the shoe, a heater positioned in each "or said depending portions, means for varying the temperature of said heaters, and-a back gage which is arranged below and rearward of the bridge portion of said support and is adapted to beengaged by the rear end of the shoe, said back gage being initially movableinto difi'erent fixed operating positions with relation to said support; said bridge portion being adapted to break an adhesive bond securing the over} lasted upper of the shoe to the heel seat portion of the attached outsole of the shoe in response to movement of said shoe, heel end first, over the bridge portion thward and into engagement with the back gage. v

. a 199 breakin sane are; is esmsinstisa 5 a work support comprising a thin wedge-shaped bridge portion which has an apex edge and is constructed and arranged for reception between the overlasted upper of a shoe and the heel seat portion of an attached outsole of the shoe, and depending portions which are continuous with opposite ends of said bridge portion and are of sub stantial mass and are spaced from each other by a distance substantially greater than the width of the shoe, a heater positioned in each of said depending portions, means for varying the temperature of the heaters, a back gage which is arranged below and rearward of the bridge portion'of the support and is adapted to be engaged by the rear end of the shoe to limit movement of the shoe, said back gage being initially adjustable into different fixed operating positions, a pair of bond breaking knives, means for continuously vibrating said knives in engagement with and transversely of the bridge portion of the support, means for causing the bridge portion of the support normally to mask said knives, said bridge portion of the support being slidable toward the back gage when engaged by an adhesive bond securing the heel seat portion of the outsole to the overlasted upper of the shoe as the shoe is moved heel end first toward the back gage whereby to enable the knives to operate upon said adhesive and to cooperate with an apex edge of the wedgeshaped bridge portion to break said bond forwardly to a heel breast line of the outsole of the shoe determined by the engagement of the rear end of the shoe with the initially adjusted back gage.

MacDonald Ian. 11, 1938 Hazelton Nov. 21, 1939 

